I never thought much about what I wore when I used the lathe. But then one day while wearing my face sheild on this day saved me. Here is the chunk of wood that came off my turning. I was turning at about 1000 rpm. The first hit was on the sheild, but would have hit me in the right eye without the shield. From there is glanced off and hit my chest, with a smock and shirt to protect me. It turned black and blue plus taking over a week before the pain totally went away. So it was a hard hit!
So now when I turn small projects I may just wear saftey glasses. But when I turn larger chunks or anything that does not look stable the face shield goes on.